nicehash is not the best.
If you're in AMD RX470/480/570/580 here's what I recommend
You want to play it safe and cash early ? mine ethereum with nanopool
You want to speculate and make a lot more (but have to wait and HODL for weeks)? mine smaller altcoins like ETN, ELLA, PIRL and see the prices pump few weeks after
You're just starting and don't understand most of this, and accept making lower profits? use nicehash